mirror of
https://github.com/matrix-construct/construct
synced 2024-11-16 06:51:08 +01:00
160 lines
3.3 KiB
C++
160 lines
3.3 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2022 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_INSTANCE_MAP_H
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namespace ircd {
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inline namespace util
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{
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template<class K,
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class T,
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class C = std::less<K>>
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struct instance_map;
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}}
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/// See instance_list for purpose and overview.
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template<class K,
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class T,
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class C>
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struct ircd::util::instance_map
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{
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static std::map<K, T *, C> map;
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protected:
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typename decltype(map)::iterator it;
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template<class Key>
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instance_map(const typename decltype(map)::const_iterator &hint, Key&&);
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template<class Key>
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instance_map(Key&&);
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instance_map(instance_map &&) noexcept;
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instance_map(const instance_map &);
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instance_map &operator=(instance_map &&) noexcept;
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instance_map &operator=(const instance_map &);
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~instance_map() noexcept;
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};
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template<class K,
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class T,
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class C>
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template<class Key>
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inline
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ircd::util::instance_map<K, T, C>::instance_map(Key&& key)
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{
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auto [it, ok]
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{
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map.emplace(std::forward<Key>(key), static_cast<T *>(this))
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};
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if(unlikely(!ok))
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throw std::invalid_argument
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{
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"Instance mapping to this key already exists."
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};
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this->it = std::move(it);
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}
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template<class K,
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class T,
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class C>
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template<class Key>
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inline
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ircd::util::instance_map<K, T, C>::instance_map(const typename decltype(map)::const_iterator &hint,
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Key&& key)
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{
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auto [it, ok]
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{
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map.emplace_hint(hint, std::forward<Key>(key), static_cast<T *>(this))
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};
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if(unlikely(!ok))
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throw std::invalid_argument
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{
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"Instance mapping to this key already exists."
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};
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this->it = std::move(it);
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}
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template<class K,
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class T,
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class C>
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inline
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ircd::util::instance_map<K, T, C>::instance_map(instance_map &&other)
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noexcept
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:it
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{
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std::move(other.it)
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}
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{
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if(it != end(map))
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{
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it->second = static_cast<T *>(this);
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other.it = end(map);
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}
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}
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template<class K,
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class T,
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class C>
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inline
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ircd::util::instance_map<K, T, C>::instance_map(const instance_map &other)
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:it
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{
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other.it != end(map)?
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map.emplace_hint(other.it, other.it->first, static_cast<T *>(this)):
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end(map)
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}
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{}
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template<class K,
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class T,
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class C>
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inline ircd::util::instance_map<K, T, C> &
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ircd::util::instance_map<K, T, C>::operator=(instance_map &&other)
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noexcept
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{
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this->~instance_map();
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it = std::move(other.it);
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if(it != end(map))
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it->second = static_cast<T *>(this);
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other.it = end(map);
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return *this;
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}
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template<class K,
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class T,
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class C>
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inline ircd::util::instance_map<K, T, C> &
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ircd::util::instance_map<K, T, C>::operator=(const instance_map &other)
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{
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this->~instance_map();
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it = other.it != end(map)?
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map.emplace_hint(other.it, other.it->first, static_cast<T *>(this)):
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end(map);
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return *this;
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}
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template<class K,
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class T,
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class C>
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inline
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ircd::util::instance_map<K, T, C>::~instance_map()
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noexcept
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{
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if(it != end(map))
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map.erase(it);
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}
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